Fixed shell
Ball, AP, tracer, and WP and HE incendiary rounds were available

Weight of projectile

0.11 lbs
50 g

Velocity

2641 feet per second
805 meters per second

Maximum
elevation

85 degrees

Range

6560 yards
2000 meters

Altitude

13,060 feet
3980 meters

Rate of fire

460 rounds per minute

This was a Hotchkiss design that proved unwieldy (due to its heavy
naval mountings, which weighed at least 249 pounds or 113 kg) and
ineffective in combat. Like its closest Allied counterpart, the Browning 0.50 machine gun,
its round was much too
light to make it an effective naval light antiaircraft weapon. It was
air-cooled, with distinctive cooling fins around the chamber, and it
used a gas-operated action. The gas cylinder connections made barrel
changes difficult and slow. The magazine held 30 rounds, reducing the
effective rate of fire to about 250 rounds per minute. The maximum
effective range was much less than the nominal range, about 1500 meters
or 4900 feet.

It also saw limited use as a land weapon, with
some 1494 available to the Japanese Army towards the end of the war.